millwright_20210113192306 Flashcards
Wire rope used to hoist personal breaking strength is 6000 lb. What is the max you can lift?
10:1=600 lbs
There are 4 rollers moving in horizontal load. Weight is 48 tons. What is the minimum capacity allowed for 2 rollers?
48 Ton
Where do you measure a wire rope?
Largest diameter
Length of wire rope required to make 4 dead wraps over a drum?
Pie times D times 4
Shackle has bad threads, what do you do?
Take it out of service
Sling has acid damage, what do you do?
Take it out of service
What do you attach 3 or more slings being used to choke a pipe to?
A shackle on hook
What are scaffold planks made out of?
Rough fir
What is area of crane outrigger block?
3:1 Take area of outrigger pad times 3
What do you use to check for cracks on Aluminum fan blade?
Dye penetrant
Belt on a crown pulley is out of alignment. What do you do?
Increase the crown
Bridge on overhead crane is misaligned. What do you do?
Align rails
When changing hacksaw blade, what steps would you take?
Loosen nut, install blades tooth facing forward, retighten
On a new commissioned system, what is the first thing you do?
Bleed the lines
A fully loaded flat belt is running off alignment, what do you do?
Re-adjust load to the centre of belt
A bucket conveyor is jacking and dropping load, what is the problem?
Missing tooth on drive sprocket
A secured pump mount, motor running high.
Follow manufacturers specs.
Before coupling new installed motor to pump, what do you do?
Check motor rotation, then couple
Compressor is run up, what do you re- torque?
Cylinder head cover.
A v-belt is turning over in its sheave. What do you do?
Replace sheave.
A fluid coupling is slipping, what do you do?
Add oil, check temperature.
Store a cable jack…
Separately and coil rope.
Know hand signal….
Boom up, hold the load
Know hand signal….
Extend boom.
Wedge socket is used to?
Change out line frequently.
How many turns do you open an acetylene valve?
1 to 1 1/2 turns
Where do you add lubricant on roller chain?
Between link plates.
What does blue smoke coming out of exhaust pipe of engine indicate?
Worn piston rings.
You have uneven wear on a friction clutch, what is the problem?
Misalignment.
When cutting a steal, what flame do you use?
Neutral.
A pump when shut off is not staying primed, what do you check?
Foot valve.
When checking for pipe strain, where do you put your dial?
Discharge flange.
A tank is sitting unevenly on concrete, how do align permanently?
Shim then grout.
A pump produces 12 gpm, the reservoir tank only holds 9 gallons. The pump is overheating, what is the problem?
The tank is too small for the pump.
To prevent a load from rotating on you during a lift, what would you use?
A tagline.
A hydraulic fitting is leaking, what is cause.
Damaged ferrule fitting.
A fixed bearing on a pump is located where?
On the driver side.
A tank collapses inward while draining fluid. What is the cause?
Faulty or clogged vent.
When installing a filter on a hydraulic system, put it….
Upstream of pump inlet.
PSV on compressor is popping, why?
High system pressure
You are told to level .050 shim at 18.” How many shims at 6’?
.050 divided by 18 * 72”=.2
What is the maximum allowed chain slack?
2%
A double stage reciprocating compressor oil is changed and is still overheating. Why?
Dirty inter cooler fins
When welding a long piece, how do you weld?
Stager weld and start welding from centre and work outward.
Hydraulic cylinder when retracting is hammering to the bottom. What would you do.
Use bigger cushion on cap end.
Leaking gas charged accumulator. What would you do?
Change the bladder.
Scribing 30” diameter circle, what would you use and how do you set it?
Use a trammel and set it to the radius.
Weight on 180 degree apart on shaft is?
Couple imbalance.
Coupling on motor and pump is open in the bottom and touching on the top, where would you add your shims?
Add shims on the front side of the motor.
An eye wash station is empty, what would you refill it with?
Potable water.
How do you store a new bearing?
Leave it in the package and store it in dust free environment.
What is the artificial respiration dealing with stationary engine?
Air is forced into engine
What controls the collapse of the primary field in the coil on an electronic ignition system?
Transistors
7:1 compression ratio, what is most likely causes of preignition?
Carbon deposits glowing red cause of detonation=low octane levels.
On a 4 cycle engine, intake valve opens + closes once while the crankshaft turns how many degrees.
720 degrees
What does a magneto ignition system consist of?
Coils(transformer), spark plug, generates its own power.
What is a micron?
Millionth of a meter .001 mm
Excessive crankshaft deflection will most likely cause?
Broken crank, or fatigue failure.
Propane and most gas carbs use a?
Spray bar or nozzle.
On a gasoline carb how is the amount of gas delivery controlled?
(Butterfly valve) throttle valve
What is the turbine called that has H.P. & L.P section on separate shafts?
Cross compound.
This component is a special soft ply between the top cover and the carcass to reduce impact damage to the carcass?
Breakers
Best arrangement for setscrews?
90 degrees apart
Wear rings are used to do what on a single suction overhung pump?
Prevent recirculation to intake from suction.
Balance holes are used on what kind of pump?
Centrifugal radial( open, semi, closed)
In a 2 stage recipe compressor, discharge pressure cannot be maintained because of what?
Leaking exhaust valves.
High intercooler pressure cannot be maintained of what?
Leaking intake on second stage.
E6010, type of first papa action?
Short whip.
Aeration in a hydraulic tank is caused by what?
Low oil level, leaking intake fitting, leaking pump seal, turbulence in tank.
Power plant combustor to the turbine is connected how?
Transition piece
Gas turbine, highest pressure is where?
Diffuser
Chain rides at the tips of the sprocket, what is the problem?
Chain stretched.
To camber a chain means what?
Create crest on bottom of chain.
Hydraulic pump checking, what 3 tools are needed?
Pressure gauge, flow meter, rpm tool
Quenching quickest method?
Water
Phase is measured by what?
Strobe light.
High vibration reading after start up, why?
Misalignment
Diesel misfire caused by what?
Bad injector
Black exhaust smoke in diesel indicates what?
Too much fuel (too rich)
Oil darkens from what?
Oxidation
What happens when a balanced spool valve if the oriface is plugged?
It will dump
High amp draw on vacuum blower. Amperage drops because?
Load.
Safety factor for personnel lifting?
10:1
Type of steel for tools?
Chromium vandelium
Over speed trip is mounted on what?
Shaft.
What happens in a face to back angular contact set up?
Controls thrust in only one direction.
Setting a tapered roller bearing what is the clearance?
1/3 total clearance.
Most turbine erosion takes place where in a steam turbine?
L.P.
Large blades are found where in a turbine?
L.P.
Class of extinguisher for sawdust?
Class A.
What part on a flexible steel grid coupling wears out first?
Steel grid.
Step up voltage device is called?
Transformers
Voltage is like pressure in hydraulics so we call the voltage?
Electrical pressure.
Amperage should be checked how?
In the circuit.
Voltage should be checked where?
E=I*R
Centrifugal blowers or compressor, control output is controlled by what?
Inlet throttling
Identify correct mounting of wire rope clips on wire thimble.
Saddle on live line.
Emergency blow down valves prevent?
Over pressuring system.
What does large diameter steam blading allow for?
High volume of steam.
What is used to help prevent steam leakage from blade sections?
Shrouding
Lacing is used in what section?
L.P. Section.
Labyrinth seals seal on the principle of?
Brunellies principal, turbulent, knife edges.
Carbon rings are machined because they?
Fit to very close tolerances?
Spherical bearings used on turbines to?
Compensate for sag on shaft?
For expansion on turbines sliding dovetail are used?
On rotor for holding reaction blades.
Name for stationary blades?
Nozzles.
What do the moving blades of a turbine connect to?
Disc or drum.
The transition piece connects the inner lines of the power plant combustor to?
Turbine, connects combustor chamber to turbine.
S.A.V. Is closed by?
Governor
Condensor in the turbine allows steam to perform more work by reducing pressure. True or false?
True, more efficient.
If you get fluctuating readings when you first start, wait for readings to settle
Hunting
Drive belt vibrations amplitude is most likely the highest in line with?
Sheaves, direction of belt is pulling on sheaves.
Vibration signal is also known as?
Signature or signal.
When taking vibration readings on bearings, the readings should be taken on?
Acceleration horizontal, vertical, axial.
What is gear mean frequency of a single gear reduction gear box with input speed of 36000 rpm and output speed of 1060 with 24 teeth pinion?
1440
If you are taking vibration readings under 600 rpm use?
Displacement
How are suction and discharge valves operated?
Differential pressure at pump.
What does volume on a centrifugal pump depend on?
Resistance to flow.
Where does maximum impeller wear widely with semi fluid solids?
Blade tips.
Major types of seals used in pumps?
Static dynamic.
When pumping clear uncontaminated H2O with constant pressure on suction side of pump, the stuffing box should work well with what kind of packing.
Solid packing.
What is the reason for using steam throttle valves on large pumps?
Direct connected valves require too much force.
What can be done to modify a reciprocating pump to make it provide a steady and continuous flow of liquid?
Add air chambers to outlet side(accumulator)
What happens when discharge valves are closed on centrifugal pump?
Discharge pressure goes down and the pump slips to max.
Gate valves are used as intake & discharge valves because of?
Low pressure loss.
What is the cause of low suction lift?
Manufactures ratings.
Which process is used to seal mechanical seals in an emergency?
Lapping.
How do you bring a coil of packing down to exact size?
Roll it with a piece of pipe.
What is the function of an electrical interlock to enable system that slips on startup?
Times the functions.
What is the probable cause of gravity take up system that slips on startup?
Take up weight too light.
On a belt conveyor that must be started under full load, what kind of drive should it be?
Fluid coupling.
What chain is best used in abrasive conditions?
Mill chain.
On an overhead conveyor with a compound vertical curve, the purpose of the straight section of track is?
To gain the required amount of elevation.
A belt that has a section of it that always runs out of alignment is probably caused by?
Improper or uneven splice.
Increasing co-efficient of friction on a drive pulley without increasing tension can be accomplished by?
Lagging snub pulley increases arc of contact.
Easiest way to change speed of conveyor?
Change sheave or sprocket diameter or VFD.
On a bucket elevator, the length of the splice should be?
Equal to the width of belt.
On pneumatic dust conveyor piping, the amount of wear is?
On the outside radius of elbow.
Millwrights measure electrical pressure with what kind of meter?
Volt meter.
What steps up or down voltage?
Transformer.
Bearings on electric motor, lock bearing is on what end of motor?
Drive end.
Most common way to reverse direction on a dc motor?
Reverse armature lead.
What is root cause analysis?
Why equipment failed.
Who is responsible for providing MSDS?
Suppliers.
Oxidizing material symbol is?
Flame on circle.
